A politician has held up a pair of thong underpants in the Irish parliament chamber to protest against the treatment of alleged rape victims in court.

Solidarity TD Ruth Coppinger raised the issue of “rape myths” after one jury in a recent case was asked to consider the fact that the complainant was wearing a thong at the time of the alleged assault.

While holding up the underwear she said: “It might seem embarrassing to show a pair of thongs here in this incongruous of the Dail. But the reason I’m doing it: how do you think a… woman feels at the incongruous setting of her underwear being shown in a court?

“How heroic do you have to be Taoiseach (Prime Minister), to pursue a rape trial in this country?” she asked.

I hear cameras cut away from me when I displayed this underwear in #Dáil. In courts victims can have their underwear passed around as evidence and it's within the rules, hence need to display in Dáil. Join protests tomorrow. In Dublin it's at Spire, 1pm.#dubw#ThisIsNotConsentpic.twitter.com/DvtaJL61qR

“This case and the particular awfulness of what was said is endemic in our judiciary system and it’s par for the course, it’s actually very regular to see this type of thing be brought up in any case of sexual violence, particularly sexual violence against women.

“We decided to call this rally not just specifically about this case, but calling for an end to victim-blaming in courts.

“This is really a demand for systemic change for people, particularly women, but every victim of sexual violence, to get a fair hearing. We can’t wait any longer.

“It’s indicative of the huge amount of anger there, not just about this court case, but this symbolises the problems that are inherent in the system.

“The international solidarity that’s been extended to these awful cases when they’re exposed will go a long way towards pushing for genuine legal change, and unfortunately that comes from above, but we’re going to push from below to ensure it happens now.”